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Goodwill and Identifiable Intangible Assets - Change in Net Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 1,912.0 [1]
Year-to-date translation adjustments (2.6)
Acquisition-related adjustments 153.9
Ending Balance 2,063.3 [1]
Cabinets [Member]  
Goodwill [Line Items]  
Beginning Balance 926.3 [1]
Year-to-date translation adjustments (0.4)
Ending Balance 925.9 [1]
Plumbing [Member]  
Goodwill [Line Items]  
Beginning Balance 745.2 [1]
Year-to-date translation adjustments (1.6)
Acquisition-related adjustments 7.1
Ending Balance 750.7 [1]
Doors & Security [Member]  
Goodwill [Line Items]  
Beginning Balance 240.5 [1]
Year-to-date translation adjustments (0.6)
Acquisition-related adjustments 146.8
Ending Balance $ 386.7 [1]
[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.